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cos300 = -
tan225= 1
sin300= -
- / 1 - = 0/1/2 = 2
= sin 30 derajat = 1/2
cos 300 derajat = 360-300
= cos 60 derajat = 1/2
tan 225 derajat = 270 derajat-225 derajat
= tan 45 derajat = 1
karena sin negatif ada di kuadran 4, maka menggunakan rumus kuadran 4
-sin 300 derajat = 360 derajat- 300 derajat
= sin 60 derajat = 1/2√3
sin 150 derajat + cos 300 derajat/tan 225 derajat - sin 300
= 1/2+1/2÷1-1/2√3
= 1÷1-0,87
= 1/0,13
= 10/13